When Do You Weed And Seed Your Lawn

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How Many Days Do You Have to Wait Before Seeding After Weed & Feed?. Weed and feed fertilizers are often used in combination with seeding. Weed and feed formulations consist of two components: a herbicide to kill weeds and a fertilizer to strengthen the turf. The herbicide will weaken the grass as well as the … Weed and feed lawn products combine a lawn fertilizer with a weed killer and/or weed preventer in one product. Different turfs call for different types of products, and application timing is critical. Check out these tips for before and after application for lawn weed and feed fertilizer. Weed and feed is an all-in-one product that promises to fertilize your lawn & prevent weeds in one application—learn if it’s the best solution for your yard.

How Many Days Do You Have to Wait Before Seeding After Weed & Feed?

Weed and feed fertilizers are often used in combination with seeding. Weed and feed formulations consist of two components: a herbicide to kill weeds and a fertilizer to strengthen the turf. The herbicide will weaken the grass as well as the weeds and the fertilizer will strengthen the weeds as well as the grass. When applying seed over a weed and feed application, remember that some weed and feeds can prevent grass seeds from growing.

Types of Herbicide

It’s important to know a little about herbicides so you can make the best choice for when to apply seed in an area that has been treated for weeds. The most common types of herbicide in weed and feed products are selective and systemic. Selective herbicides target a species of plant to kill while systemic herbicides work by being absorbed though the roots and then transported throughout the plant, killing it from within. Read the bag label to see what kind of herbicide is used in the weed and feed you are considering using or have used. The bag label will tell you how many days you must wait before applying seed to a lawn that has been treated with that product.

Seeding

Herbicides can target weeds before they germinate from seed – pre-emergent – or as developed plants – post-emergent. Before you seed, you can use a non-selective, post-emergent herbicide to control any weeds in the area to be seeded. Most of these can be applied up to two weeks before seeding to control any existing weeds. Herbicides should not be used after seeding until the new seedlings are established. Mowing and spot treatments can be used to control weeds until the seeded area is actively growing and requires only maintenance watering. Establishment times vary depending on the type of seed you use and your weather conditions.

Using Weed and Feed

Only use a weed and feed if the weed infestation is completely uniform over the entire lawn and all species of weeds targeted will be affected by the herbicide in the weed and feed. This scenario doesn’t occur often, so it is more likely the use of an herbicide and a fertilizer separately will be needed. If the weeds are uniformly spread over the area to be treated, match the appropriate weed and feed product to your grass, the seed you have recently applied or want to apply, and the time of year.

Know What You Grow

It is important to know what kind of grass you have growing or want to have growing. Certain chemicals act differently on different species of grass and weeds. For example, the common herbicide 2,4-D is toxic to some cultivars of St. Augustine grass (Stenotaphrum secundatum), which grows in the area roughly covered by U.S. Department of Agriculture plant hardiness zones 8 through 10. Another common herbicide, atrazine, is potentially lethal to grass when applied in temperatures above 85 degrees Fahrenheit. Use the instructions on the bag of each weed and feed product to determine how it will affect seeding.

  • University of Florida IFAS Extension: Weed Management in Home Lawns
  • Texas Agricultural Extension Service: Maintaining St. Augustinegrass Lawns

Sara DeBerry is a graduate of the University of Florida holding a masters degree in environmental horticulture and a minor in entomology and nematology. DeBerry has been writing for government agencies since 2004 and has published peer reviewed scientific articles during her studies at UF.

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Weed And Feed Lawns: Where To Begin

Weed & Feed products combine a lawn fertilizer with a weed killer and/or weed preventer in one product. One application does double duty, treating random weeds spread across an entire lawn while also feeding and greening grass. Weed & Feeds come in two basic formulations, granules and liquids. But before you make an application, here are some things you need to know about weed & feed products.

Weed & Feed Starts With Weeding…

The “weed” half of “weed & feed” contains some mix of herbicides to kill lawn weeds. Almost all products contain a post-emergent herbicide, but some also combine a pre-emergent herbicide designed to prevent new weeds from sprouting.

Post-Emergent herbicides kill existing lawn weeds like Dandelion, Clover and many other common weeds. The complete list of weeds can be found on your product’s label. These post-emergents are always selective herbicides, so they will not harm existing grass when applied as directed. New innovations, like BioAdvanced 5-in-1 Weed & Feed, also kill grassy weeds like Crabgrass, eliminating the need for multiple applications of additional herbicides to achieve control.

Pre-Emergent herbicides are meant to keep new weeds from germinating and growing. Timing is the key, apply too early and the preventer can become ineffective while weeds are still dormant. Apply too late and seeds may have already germinated. You’re probably most familiar with Crabgrass preventers that are applied in early spring.

…And Ends With Feeding

The “feed” half of “weed & feed” is all about fertilizer. Most fertilizers are a mix of nitrogen and other macro-nutrients, and sometimes micro-nutrients, in varying amounts. Nitrogen (N) is the most important element in lawn fertilizers and comes in two basic forms – fast-release and slow-release. Most lawn fertilizers include a mix of fast-release and slow-release forms to provide quick green-up and sustained growth.

Fast-Release Nitrogen (often referred to as water-soluble nitrogen or WSN) such as urea and ammonium sulfate, is readily available and absorbed quickly by the grass, resulting in fast green-up. Unfortunately, it can also can burn your lawn if applied improperly, and can leach through the lawns root zone or run off the lawn in heavy rain, causing pollution.

Slow-Release Nitrogen (often referred to as WIN or water-insoluble nitrogen), such as sulfur-coated urea, methylene urea and animal manures, are released more slowly to the grass and provide more sustained, even growth – up to 3 months for methylene urea.

Before You Begin, Know Your Lawn Type

Before applying any type of weed & feed or fertilizer product, you need to identify your type of grass. Some fertilizers can be applied to all lawn types, but most weed & feed products are specifically labeled for certain types of grasses. Apply the wrong product to the wrong type of grass and you can damage your lawn. Use caution and read the label. If you’re still unsure, use the toll-free number found on the label to contact the manufacturer.

When To Apply

Weed & Feed products are most effective when weeds are small and actively-growing, namely spring and fall.

In spring, wait to apply until you’ve mowed your lawn two times before applying to be sure it has emerged from dormancy.

In fall, be sure to check the with local Cooperative Extension System office for historical frost dates in your area. Many Weed & Feed labels will recommend application timing based on that date.

Most weed & feed products will have temperature restrictions as well, be sure to check the label. Do not apply to water-saturated soils, lawns under stress from drought, disease or prone to injury.

How To Apply

For liquid weed & feed products, be sure to use one of the sprayer types recommended on the label and follow label instructions for mixing and spraying.

For granule weed & feeds, use a rotary or drop-type spreader. Drop spreaders apply fertilizer very precisely in a narrow band directly below the spreader, while a rotary spreader broadcasts over a wider area. The application pattern is very important. Be sure to follow label instructions.

Both types of spreaders have adjustable application settings. How much fertilizer is applied varies according to the settings on the type and model of spreader you use. Read the spreader manufacturer’s instructions before fertilizing to help you calibrate your equipment to ensure proper application rates. You’ll find the proper setting for your type of spreader on the specific fertilizer label. If not, there should be a toll-free phone number to call. Do not use the spreader until you are sure it is set properly. You can learn more about calibrating your spreader and spreader settings. Be sure to read always and follow label instructions.

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Other Things You Should Know

Mowing – For best results, mow your lawn 1-2 days prior to application. Clippings from your next three mowings should be left on the lawn. Be sure not to use these clippings as mulch or compost around flowers, ornamentals, trees or in vegetable gardens.

Do Not Rake – Heavy raking will disturb the weed preventative barrier and reduce the effectiveness of this product.

Watering – Many weed & feed products instruct you to wait 24 hours before watering in. Be sure to consult your specific label.

Feeding New Lawns – Most new lawns don’t need to be fertilized until 6-8 weeks after planting. However, that can vary depending on how the soil was prepared before planting and the type of fertilizer used. Consult your local Cooperative Extension System office or nursery for recommendations on fertilizing new lawns.

Everything You Need to Know About Weed and Feed

Weed and feed is the lawn care equivalent of the shampoo-and-conditioner-in-one products in the hair care aisle. They promise to save you time while giving you the same results by applying two different products. However, you’ve probably noticed that two-in-one hair care products haven’t led to the extinction of individual shampoos and conditioners. Many people believe it’s better to weed and feed your lawn as a two-step process for much the same reason.

If you’d like a healthy green lawn but don’t like the idea of applying fertilizers and weed killers yourself, House Method’s recommended lawn care service provider is TruGreen. TruGreen has offices throughout the US and Canada, so there’s likely a TruGreen branch near you.

  • Large variety of plan options tailored to homeowners wants and needs
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What is Weed and Feed?

Weed and feed is the term used for lawn care products that contain both herbicides (weed killers, the “weed” part of the name) and fertilizer (the “feed” part). Weed and feed is designed to fertilize your lawn while also killing weeds in your grass, like dandelions and clovers.

Many people like the idea of using weed and feed because it means they only need to do a single application of product rather than separately applying herbicide and fertilizer. They see it as a way to do twice the work in half the time.

The weed killer in weed and feed is either pre-emergent or post-emergent.

  • Pre-emergent herbicides prevent weed seeds from germinating, so they need to be applied very early in the year before the weeds begin to sprout.
  • Post-emergent herbicides work on weeds that are already growing,such as moss, clover, and dandelions, so they should be applied later in the year, usually in the summer. Broadleaf weed killers might even be more effective in the fall.

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Tips for Using Weed and Feed

Suppose you still think the benefits of a two-for-one application outweigh the negative aspects of weed and feed. In that case, the Weed Science Society of America offers some tips to follow so you get the best results with minor environmental damage:

  • Please read the label before you purchase to know what you’re buying and how to apply it.
  • Identify the kinds of weeds growing in your yard and make sure the herbicide in your product targets those weeds. If you don’t know what the weeds are, contact your local Extension agent or check an online resource, such as those produced by the Extension Service.
  • Identify the kind of grass growing in your yard. A quick rule of thumb: cool-season grasses stay green all year while warm-season grasses go dormant and turn brown in winter. It would be best to fertilize cool-season grasses in the fall and warm-season grasses in the late spring or early summer. Choose a weed and feed that works in that fertilization period.
  • Apply the product with post-emergent herbicides early in the morning when the dew is on the grass, or water the lawn before applying. The granules will stick to the wet blades of grass and release the herbicide better than with dry blades.
  • Follow the directions that come with the product, including using the recommended amount at the suggested time of year or growth stage for weeds. Applying too much weed and feed or putting it down at the wrong time of year is a waste of money and could damage your lawn.
  • Keep the product off other landscape plants. If any gets on the sidewalk or driveway, use a blower or broom to sweep it back into the lawn.
  • Clean your hands and shoes after applying the product so you don’t unwittingly take the chemicals into your house.
  • Keep kids and pets out of the yard for a few days after treating your lawn. Studies show that lawn chemicals stay in the grass for at least 48 hours, and dogs who’ve been exposed to properties treated with herbicides may have a higher risk of certain cancers.
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Alternatives to Weed and Feed

The easiest alternative to applying weed and feed is to treat feeding and weed killing as two separate processes. Apply fertilizer at the time dictated by the kind of grass growing in your yard —fall for cool-season grasses, late spring or early summer for warm-season grasses.

Treat for weeds at an appropriate time. If you genuinely think you have weed seeds all over your yard waiting to sprout, apply a pre-emergent over the entire yard in late winter before the seeds germinate. If you’ve applied pre-emergent in previous years and have your weeds under control, putting pre-emergent over the whole yard may be overkill. In that case, it makes more sense to see if any weeds do come up and spot-treat them with an appropriate herbicide based on what’s growing in your yard.

A natural product called corn gluten meal, sometimes referred to by its initials, CGM, may offer some hope for an organic alternative to weed and feed. CGM is a byproduct that results from wet milling corn. An Iowa State University professor found that it reduces seed germination, and it has been patented for use as a natural pre-emergent agent. CGM is about 10% nitrogen, the main ingredient in most fertilizers, so it’s also a natural fertilizer.

But if a natural, organic weed and feed sounds too good to be true, it might be. There are several reasons why CGM hasn’t become the go-to weed and feed product:

  • CGM is very expensive.
  • It only works on certain kinds of weeds.
  • It typically requires multiple applications.
  • It must be applied at the right time to stop seed germination.

Skip The Chemical Weed Killer

The most environmentally friendly way to avoid weed killer is to pull the weeds out of your yard by hand. Weeding is never a fun task, but you don’t have to worry about chemicals being tracked into your home or being washed off and polluting local waterways if you hand-weed.

Various weeding tools are available to make the chore a little easier. These include long-handled, foot-operated tools that grip the weeds and allow you to dig up the roots without having to bend down.

The best defense against weeds is a thick, healthy lawn. Keep your property adequately watered, apply fertilizer when necessary, and take steps such as aerating when necessary may be all your lawn needs to stand tall against a weed invasion.

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